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PDF PI3VST01 Data sheet ( Hoja de datos )
| Número de pieza | PI3VST01 | |
| Descripción | HPD signal Generator | |
| Fabricantes | Pericom Semiconductor Corporation | |
| Logotipo |  |
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PI3VST01
HPD signal Generator for VGA
Features
ÎÎHot Plug Detect Signal Generator for VGA connectors
ÎÎGenerates hot plug output signal telling system when
monitor is present or not
ÎÎPower Supply, 3.3V and 5.0V
ÎÎESD tolerance on pin 7 is up to +/-4kV contact per
IEC61000-4-2 specification
ÎÎ-3dB BW of 1.7GHz (typ)
ÎÎ4.75 Ohm On Resistance with 0.5 Ohm flatness (typ)
ÎÎLow input/output capacitance (Con = 4.5pF, typ)
ÎÎPackaging (Pb-free and Green):
àà 8-contact MSOP (U)
Description
The VGA connector does not have a hot-plug pin to tell the sys-
tem that a monitor is connected. More recent video standards,
such as HDMI and DisplayPort, save power by adding a hot-plug
pin which allows graphics outputs to be powered down when a
monitor is not connected.
Pericom’s PI3VST01 HPD signal generator generates a monitor
detection signal from a VGA source connector to tell the VGA
source if an external monitor is connected or not.
PI3VST01 allows notebook makers to shut off the VGA DAC
when a monitor is not connected, thus saving 170 mW per DAC.
PI3VST01 dissipates only 0.66 mW.
The monitor detection scheme within the PI3VST01 will not
affect normal operation of the video driver.
Block Diagram
BIN
VSYNC
Logic
Control
Pin Configuration-U8 (Top View)
BOUT
Detector
HPD_OUT
GND
VDD5
BIN
VSYNC
HPD_OUT
VDD3
BOUT
Rref
RREF
All trademarks are property of their respective owners.
15-0090
1
www.pericom.com 07/08/15
1 page  
PI3VST01
HPD signal Generator for VGA
Application Schematics
In order to ensure accurate color balance, gain and frequency response are matched between the R, G, and B channels using:
• 4.7 Ohm resistors in series with the R and G lanes,
• 8.2 pF capacitors to ground from the R and G lanes, and
• a 2 pF capacitor to ground on the B lane.
To pass the VESA VSIS specification, many VGA DACs require series inductors to reduce overshoot and undershoot.
A 47 kOhm resistor is used as a pullup for the open-drain HPD_OUT signal from the PI3VST01 to the VGA DAC control.
4.7 uF capacitors should be used to bypass both VDD5 and VDD3.
The schematic below illustrates the recommended design for the 150//75 case.
All trademarks are property of their respective owners.
15-0090
5
www.pericom.com 07/08/15
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet PI3VST01.PDF ] | |
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